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SEMITERES  Rose, 1911

Type : Palmer 180, collected at San Ramon,, Durango, Mexico, 1906.

Distribution : Mexico (Durango).


Description by Rose :

Perennial, sterile branches 3 - 4 cm long, very leafy, the leaves appearing imbricate, in cultivated specimens 10 cm long, the leaves standing nearly at right angles to the stem or somewhat drooping.

Leaves 1 -2 cm long, narrow, fleshy, nearly semiterete in section, obtuse, strongly papillose, the papillae appearing more pronounced in dry specimens.

Flowering stems ascending or erect, apparently very leafy, 10 - 20 cm long.

Inflorescence a widely spreading cyme more or less papillose, pedicels slender, 2 - 3 mm long, calyx deeply cleft, the lobes ovate, 2 mm long, obtuse, petals 5, white, lanceolate, acuminate, 5 mm long, anthers dark-coloured, carpels spreading, papillose-roughened, tipped by long slender styles.

Cytology : 2n = 38, 108.


The species is nearest S. alamosanum, but is stouter and has more flattened, papillose leaves and white flowers.



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